复数在三角中的应用

我们知道,若ｚ＝ｃｏｓα＋ｉｓｉｎα,则ｃｏｓα＝１２（ｚ＋１ｚ）＝ｚ２＋１２ｚ,（１）ｓｉｎα＝１２ｉ（ｚ－１ｚ）＝ｚ２－１２ｉｚ,（２）ｔｇα＝－ｉ（ｚ２－１）ｚ２＋１．（３）利用以上三公式,借助于复数运算,可使某些三角问题得到较为方便的解决．这...     

Cathodic electrolyte engineering toward durable Zn–Mn aqueous batteries

<正>Zn–Mn aqueous batteries (ZMABs)present potential for grid-scale energy storage with the benefits of low cost,high safety and eco-friendliness [1].Since 1866 (Leclanchéwet cell), we have witnessed the prosperity of ZMABs in the primary battery market and an increasing interest in rechargeable ZMABs.     

Rhesus monkeys exhibiting spontaneous ritualistic behaviors resembling obsessive-compulsive disorder

Obsessive-compulsive disorder(OCD) is a chronic and debilitating psychiatric disorder that affects ～2%–3% of the population globally. Studying spontaneous OCD-like behaviors in non-human primates may improve our understanding of the disorder. In large rhesus monkey colonies, we found 10 monkeys spontaneously exhibiting persistent sequential motor behaviors(SMBs) in individual-specific sequences that were repetitive, time-consuming and stable over prolonged periods. Genetic analysis revealed seve...     

Preliminary study on the freeze-drying of human bone marrow-derived mesenchymal stem cells

Long-term preservation and easy transportation of human bone marrow-derived mesenchymal stem cells (hBM-MSCs) will facilitate their application in medical treatment and bioengineering. A pilot study on the freeze-drying of hBM-MSCs was carried out. hBM-MSCs were loaded with trehalose. The glass transition temperature of the freeze-drying suspension was measured to provide information for the cooling and primary drying experiment. After freeze-drying, various rehydration processes were tested. The highest recovery rate of hBM-MSCs was (69.33±13.08)%. Possible methods to improve freeze-drying outcomes are discussed. In conclusion, the present study has laid a foundation for the freeze-drying hBM-MSCs.     

Stable, biocompatible lipid vesicle generation by solvent extraction-based droplet microfluidics

In this paper, we present a microfluidic platform for the continuous generation of stable, monodisperse lipid vesicles 20–110 μm in diameter. Our approach utilizes a microfluidic flow-focusing droplet generation design to control the vesicle size by altering the system’s fluid flow rates to generate vesicles with narrow size distribution. Double emulsions are first produced in consecutive flow-focusing channel geometries and lipid membranes are then formed through a controlled solvent extraction process. Since no strong solvents are used in the process, our method allows for the safe encapsulation and manipulation of an assortment of biological entities, including cells, proteins, and nucleic acids. The vesicles generated by this method are stable and have a shelf life of at least 3 months. Here, we demonstrate the cell-free in vitro synthesis of proteins within lipid vesicles as an initial step towards the development of an artificial cell.     

从精灵到海盗的奥兰多·布鲁姆之旅

在屏幕上,奥兰多·布鲁姆扮演一个身不由己的海盗。在生活中,他是一位谦逊的超级巨星。虽然他年少多金,并且常被外界列入最火辣、最性感或最俊美男星的名单,最终让布鲁姆扬名立万的还是他那身海盗装扮。他第一个电影主要角色出现在《指环王》三部曲。在片中,     

Effects of three fluid resuscitation methods on apoptosis of visceral organs in rats with hemorrhagic shock

INTRODUCTION Hemorrhagic shock is a common clinic emer- gency case. Successful treatment includes surgical control of hemorrhage and restoration of tissue per- fusion. Current guidelines for presurgical treatment of patients with hemorrhagic shock recommend rapid volume resuscitation to normal blood pressure as quickly as possible. The practice is controversial because aggressive restoration of intravascular vol- ume and rapid increasing of blood pressure before securing hemostasis may ex…     

North Atlantic subtropical mode water formation controlled by Gulf Stream fronts

The North Atlantic Ocean hosts the largest volume of global subtropical mode waters(STMWs) in the world,which serve as heat,carbon and oxygen silos in the ocean interior.STMWs are formed in the Gulf Stream region where thermal fronts are pervasive and result in feedback with the atmosphere.However,their roles in STMW formation have been overlooked.Using eddy-resolving global climate simulations,we find that suppressing local frontal-scale ocean-to-atmosphere(FOA) feedback leads to STMW formation...